CS 15

Question 1

1. What percentage of the world’s emerald supply is estimated to come from Zambia’s Kagem mine?
   A. 20 percent
   B. 40 percent
   C. 60 percent
   D. 80 percent

Answer 1

20%

Question 2

1. To emphasize the bluish green color, cutters orient a fashioned emerald with its table
   A. parallel to the crystal length.
   B. perpendicular to the crystal length.
   C. at a 45° angle to the crystal length.
   D. at a 30° angle to the crystal length.

Answer 2

perpendicular to the crystal length

Question 3

1. The safest way to clean emeralds is with
   A. a steam cleaner.
   B. an electric toothbrush.
   C. an ultrasonic machine.
   D. gentle scrubbing with warm, soapy water.

Answer 3

gentle scrubbing with warm, soapy water.

Question 4

1. Which country is the number one supplier to the US in terms of total carats?
   A. India
   B. Japan
   C. Egypt
   D. Colombia

Answer 4

India

Question 5

1. In Colombia, modern mechanized mining of emerald by private companies began in
   A. 1955.
   B. 1977.
   C. 2000.
   D. 2010.

Answer 5

1977.

Question 6

1. Government geological surveys of Colombia’s emerald reserves suggest that
   A. only 1 percent of the country’s emeralds have been mined.
   B. only 20 percent of the country’s emeralds have been mined.
   C. about half of the country’s emeralds have been mined.
   D. almost all of the country’s emeralds have been mined.

Answer 6

only 20 percent of the country’s emeralds have been mined.

Question 7

1. The most desirable emerald hues are
   A. blue to green.
   B. bluish green to green.
   C. yellow-green to green.
   D. yellowish green to green.

Answer 7

bluish green to green.

Question 8

1. Brazilian emeralds are mined from
   A. limestone.
   B. hydrothermal deposits.
   C. solidified volcanic magma.
   D. areas where pegmatites intersect with schists.

Answer 8

areas where pegmatites intersect with schists.

Question 9

1. The trade term “Zambian” describes emeralds that are
   A. lighter in tone than “Brazilian.”
   B. lighter in tone than “Colombian.”
   C. less bluish and more saturated than “Colombian.”
   D. slightly darker and more bluish than “Colombian.”

Answer 9

slightly darker and more bluish than “Colombian.”

Question 10

1. Most facet-grade emerald mined in Brazil is from Itabira, Nova Era, and
   A. Socotó.
   B. Capoeirana.
   C. Santa Terezinha.
   D. the state of Rio Grande do Norte.

Answer 10

B. Capoeirana.

Question 11

1. Who produced a hydrothermal synthetic emerald in the 1960s by depositing a synthetic emerald layer over faceted beryl seeds?
   A. Linde
   B. Gilson
   C. Chatham
   D. Lechleitner

Answer 11

D. Lechleitner

Question 12

1. The great majority of emeralds come from Colombia, Zambia, Brazil, and
   A. Russia.
   B. Madagascar.
   C. Myanmar and Thailand.
   D. Afghanistan and Pakistan.

Answer 12

Afghanistan and Pakistan

Question 13

1. What’s the estimated percentage of emeralds with fractures filled with oil or resin?
   A. 10 percent
   B. 30 percent
   C. 60 percent
   D. 90 percent or more

Answer 13

90 percent or more

Question 14

1. Which element gives emerald a bluer green color?
   A. Iron
   B. Titanium
   C. Vanadium
   D. Chromium

Answer 14

Iron

Question 15

1. Colombia and Brazil cut most of their better-quality emerald rough and send the lower-quality material to
   A. Jaipur, India.
   B. Shanghai, China.
   C. New York, USA.
   D. Chanthaburi, Thailand.

Answer 15

Jaipur, India.